Great Southern 28-day Rainfall Forecast

period
28-day
12-month

Sun

Mon

Tue

Wed

Thu

Fri

Sat

25
low

26
med

27
med

30
med

31
low

Sep 1
med

2
low

3
low

4
low

5
low

7
med

8
med

9
low

11
low

12
med

14
low

16
low

17
med

18
high

19
low

Chance of rainfall within district
nil < 25%	low 25% to 50%	med 50% to 75%	high ≥ 75%

Issue Notes

The hemispheric long wave pattern has remained stable in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of South Africa, Western Australia, New Zealand, the south Pacific, and the Atlantic Ocean.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 27 August to 31 August, 7 September to 11 September, and 13 September to 17 September. Rain events originating in the tropics and moving south are possible about 20 September to 24 September.
Over Western Australia the strongest cold fronts should occur about 27 August to 31 August, 4 September to 8 September, and 12 September to 16 September.

Issued Aug 21

Forecast Explanation

This forecast is produced by a multi-model ensemble consisting of dynamical atmospheric models, which are forced by the latest observed atmosphere, ocean, land and ice conditions. The models are designed to simulate features of the real atmosphere, including the daily movement of long and short wave patterns in the Southern Hemisphere.

The future probability of rain in each district is estimated using output from the multi-model ensemble, combined with historical information about the difference between the model forecasts and observed rainfall.

In this deterministic framework the skill of the forecast tends to decrease with time, however the forecasts are updated daily to provide the latest estimates of rainfall probability out to 28 days.

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